创建播放声音的按钮，得到NSException错误

问题描述：

import UIKit 
import AVFoundation 
import AudioToolbox 



class ViewController: UIViewController { 

    var player : AVAudioPlayer? 

    func playSound(){ 
     let path = Bundle.main.path(forResource: "Roblox", ofType:"mp3")! 
     let url = URL(fileURLWithPath: path) 

     do { 
      let sound = try AVAudioPlayer(contentsOf: url) 
      self.player = sound 
      sound.numberOfLoops = 1 
      sound.prepareToPlay() 
      sound.play() 
     } catch { 
      print("error loading file") 
      // couldn't load file :(
     } 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    @IBAction func button(_ sender: Any) { 
     playSound() 
    } 


}

您好，我正在尝试制作播放声音的按钮（Roblox.mp3）。它编译没有错误。但是，当我打开模拟器时，它会崩溃。我的错误日志是：创建播放声音的按钮，得到NSException错误

2017-08-10 20:52:57.876 Oof[2500:252563] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<Oof.ViewController 0x7fc320607800> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key button.' 
*** First throw call stack: 
(
    0 CoreFoundation      0x000000010dcd6b0b __exceptionPreprocess + 171 
    1 libobjc.A.dylib      0x000000010aa8a141 objc_exception_throw + 48 
    2 CoreFoundation      0x000000010dcd6a59 -[NSException raise] + 9 
    3 Foundation       0x000000010a5a000b -[NSObject(NSKeyValueCoding) setValue:forKey:] + 292 
    4 UIKit        0x000000010b0f7994 -[UIViewController setValue:forKey:] + 87 
    5 UIKit        0x000000010b364a09 -[UIRuntimeOutletConnection connect] + 109 
    6 CoreFoundation      0x000000010dc7ce8d -[NSArray makeObjectsPerformSelector:] + 269 
    7 UIKit        0x000000010b3633bf -[UINib instantiateWithOwner:options:] + 1856 
    8 UIKit        0x000000010b0fdfc3 -[UIViewController _loadViewFromNibNamed:bundle:] + 381 
    9 UIKit        0x000000010b0fe8d9 -[UIViewController loadView] + 177 
    10 UIKit        0x000000010b0fec0a -[UIViewController loadViewIfRequired] + 195 
    11 UIKit        0x000000010b0ff45a -[UIViewController view] + 27 
    12 UIKit        0x000000010afc798a -[UIWindow addRootViewControllerViewIfPossible] + 65 
    13 UIKit        0x000000010afc8070 -[UIWindow _setHidden:forced:] + 294 
    14 UIKit        0x000000010afdaebe -[UIWindow makeKeyAndVisible] + 42 
    15 UIKit        0x000000010af5437f -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4346 
    16 UIKit        0x000000010af5a5e4 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1709 
    17 UIKit        0x000000010af577f3 -[UIApplication workspaceDidEndTransaction:] + 182 
    18 FrontBoardServices     0x00000001111765f6 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 24 
    19 FrontBoardServices     0x000000011117646d -[FBSSerialQueue _performNext] + 186 
    20 FrontBoardServices     0x00000001111767f6 -[FBSSerialQueue _performNextFromRunLoopSource] + 45 
    21 CoreFoundation      0x000000010dc7cc01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 
    27 Oof         0x000000010a1429b7 main + 55 
    28 libdyld.dylib      0x0000000110b2d65d start + 1 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException 
(lldb)

我真的不确定发生了什么问题。我相信我想要的声音被导入到Xcode中，因为我将它拖放到我的项目中。如果错误是在请求声音的那一行，我可能没有正确格式化它。我已经将它看作@“mp3”和typeOf（“mp3”）。再次，如果这看起来很简单，对不起。我刚开始的时候很快，而且还有一些我正在努力挣扎的语言障碍。

异常原因_这个类不是关键值编码兼容键**按钮** _建议你的'ViewController'没有名为'button'的'@ IBOutlet'，但故事板有一个连接到它。这通常发生在您完成一些连接后编辑源代码时。检查所有故事板连接，并将'@ IBOutlet'连接（不是'@ IBAction'连接）删除到'button'。用网上的错误信息搜索，你可以找到很多文章，其中一些文章详细描述_how to_。 – OOPer

https://*.com/questions/24393495/playing-a-sound-with-avaudioplayer请尝试检查此链接，如果它适合你 –

答

打开你的故事板并转到连接检查器，你可以看到类似下面的截图。

@IBOutlet连接绑定，但未知的故事情节。这可能是导致应用程序崩溃的一个原因。

创建播放声音的按钮，得到NSException错误

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